It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 165 644 is not a prime number.
For example, 165 644 can be divided by 2: 165 644 / 2 = 82 822.
For 165 644 to be a prime number, it would have been required that 165 644 has only two divisors, i.e., itself and 1.
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165 644 is an even number, because it is evenly divisible by 2: 165 644 / 2 = 82 822.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 165 644 is about 406.994.
Thus, the square root of 165 644 is not an integer, and therefore 165 644 is not a square number.
The square of a number (here 165 644) is the result of the product of this number (165 644) by itself (i.e., 165 644 × 165 644); the square of 165 644 is sometimes called "raising 165 644 to the power 2", or "165 644 squared".
The square of 165 644 is 27 437 934 736 because 165 644 × 165 644 = 165 6442 = 27 437 934 736.
As a consequence, 165 644 is the square root of 27 437 934 736.
The multiples of 165 644 are all integers evenly divisible by 165 644, that is all numbers such that the remainder of the division by 165 644 is zero. There are infinitely many multiples of 165 644. The smallest multiples of 165 644 are: